1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ed8baa64932a0f92463d4f3ad01d116c05d317ef11fb0b3a3d5dd7f913849ce. Chain 2 (Bitcoin): anchored in block 953750 (2026-06-15T06:12:23Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a968ee0a-69eb-4159-a6ff-b27d1c075c1b.json and https://artists.proofprofile.net/proofs/artist/a968ee0a-69eb-4159-a6ff-b27d1c075c1b.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53538f10262a46302e31c32994b71d628afe44ed80649a05b08901895a01212a. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ZAC012301472.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe84039276357c37b67b17bc10311de189e146a9691915c9cfcb357484ad84525. Chain 2 (Bitcoin): anchored in block 960150 (2026-07-29T21:51:49Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ZAC012401428.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x049c45645278f7b18484447748f9f60dd0ccdd61bb3eeaedbfe58560dde3e5c1. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ZAC012401433.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x122f02e932847c163bfa362265a5e7925e5657f8fe21b5a04348c6fa3e6dd0e5. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ZAC012301121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e232a0d1f04daafb76e371310d84b2977e432872d2474c13a4345130839e06d. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ZAC012301128.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x789b57af2f60b60e1b86e158cfe0229199a48e5d647d130bbe99b2b08cd64d70. Chain 2 (Bitcoin): anchored in block 957032 (2026-07-07T11:43:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ZAC012301130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cd8e6348f6497bc67c4150fb3fe7562f3e6704c7c72b5ed3c2c5df969667055. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ZAC012301131.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc73a9b0e7982c5e6ce23d5de0df131c2959c8a570f5525df1820adc3b39f58ba. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ZAC012301132.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2eea097d38fcc8fc61c07b8db6bf77222332b4bfcb8dbe4ef48455b33c8c466. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ZAC012301133.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x431346bf9d5c5904bf7fc1cbcf00f8325a3d74e0074bacceb3c0092e5d8f673f. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ZAC012301136.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41a80ba9619d72cd899163e2068012fea4b17faf381dc3d9597037ea8b8d031e. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ZAC012301139.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b676707d2baf0a4ff21cd036c1c4517e5f99cfede98f483e3b7ed4ac5ac78fb. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ZAC012301144.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x012a206e2a231e4c50a20c0a9c47c9effd219de6c2c19dedd7b76113cbfe96c2. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ZAC012301145.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74be956ae0baa420bfb3277a6eca32acfd95df53f7016ccf98b1f0a7d79912de. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ZAC012301147.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42ef5fa0312ab0aa39ce8df00ede611965e2349492b3356fd9757a372e67589c. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ZAC012301148.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd75ca7bb9dfbff583273273ad820b62e0f5cb16ad67e5e7637dd41db416f6e00. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ZAC012301149.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x076f3dab459859c4ed44b15ee08560b3305d953a738c5e125c84aea049facb71. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ZAC012301386.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfaa521f10d20fef777a1f89a94037bd998d94274589e9ef3ebac58c2fddfe3ff. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ZA9Z42300008.